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<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>017-严格模式.html</title>
	<script>
		// "use strict"
		function sayHi(){
			alert(!this);
		}
			"use strict"

		function sayHello(){
			// "use strict"
			alert(!this)
		}
		sayHi();
		sayHello();
	</script>
</head>
<body>
	
</body>

</html>